After listening to the other 3 soundboard (Ultra-Matrix) sources (9365) (143376) (143441) They all seem to be from the same feed.
(9365 & 143441) Mastered on DAT and Charlie's (143376) to Master Cassette. The first 2 DAT copies in Circulation
contain a audience source for Me & My Uncle and Big River. Charlie's Cassette's have the soundboard for these songs.
This source is Soundboard to DAT with Soundboard for the whole show including Me & My Uncle and Big River.